I am running OS X Server 10.4.11. I have been having a problem with my CPU usage constantly running at 100%. If I restart, it is back to 100% within minutes. Activity Monitor with "All Processes" selected is not showing me anything using more than 5% and there are only a few of those. However, the summary at the bottom of the screen is showing % User of approx 30% and % System as appros 70%. How can I find out what is hogging my CPU cycles?